Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d6b360623c8fb0…

MALICIOUS

PDF

85.9 KB Created: 2021-04-15 04:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f6b264eceae05aff26883983c20c68a5 SHA-1: 2bd5feb88445d57002bd118857d1a923bf911465 SHA-256: b1d6b360623c8fb042a445a63c9cd5812f1755da5f43ac2526be569f47aedbec
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The embedded content, though garbled, appears to be related to a search query, further supporting the lure-based attack pattern. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/strik?utm_term=why+is+there+no+picture+on+my+tv+but+there+is+sound PDF link annotation
    • http://xulikugo.iblogger.org/rewilosulipowadar.pdfIn PDF document text
    • https://ludasajuwo.weebly.com/uploads/1/3/4/0/134096591/1639777.pdfIn PDF document text
    • https://zepudelewow.weebly.com/uploads/1/3/2/6/132682561/wunik_lefurir_gerek_kajuzubelol.pdfIn PDF document text
    • http://rejawulomov.mywebcommunity.org/ganelekutulomebuzuwupul.pdfIn PDF document text
    • http://zifufarox.getenjoyment.net/dekotulutosazibuzog.pdfIn PDF document text
    • http://pivojowemetobiv.mywebcommunity.org/bavitubujojore.pdfIn PDF document text
    • https://jelifamije.weebly.com/uploads/1/3/4/3/134320618/0a8511b1e.pdfIn PDF document text
    • https://nebunabimumebu.weebly.com/uploads/1/3/4/4/134480995/kofaja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/600c630d-b5e7-429c-9d3b-84a2b82aaf02/lejemasinojemurajufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d1458ba-374b-4b8c-ae7e-3a1343ea1614/fanefiwikufidomi.pdfIn PDF document text
    • http://libejejizu.epizy.com/84633530646.pdfIn PDF document text
    • https://f5d5bca3-0ffd-41e3-a77d-3d805a1e43e5.filesusr.com/ugd/4e23ca_57160e2900974f139b2049c45a70e24b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b76e33-d294-41d4-8886-3f8bb6b1f57c/what_books_make_up_the_catholic_bible.pdfIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_a5bc4c785b0948dc90d92dfa3dbe51be.pdf?index=trueIn PDF document text
    • http://xivonopegag.epizy.com/ammonia_buffer_solution_preparation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82f4eefd-af5c-4fb9-b5b7-33d7f8b0a1ad/how_to_remove_burners_from_a_weber_gas_grill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99c7f5b0-f00c-4883-b4ec-68460e575a3a/kakaz.pdfIn PDF document text
    • http://bidejepeko.onlinewebshop.net/nurodedidowaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb8fa86-fec7-44fe-8298-663b3bd44fdd/mipukigunokosokulepudek.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 5388 bytes
SHA-256: e709951fc317732b04d06475d6943b9d942d6b60717cff0759ce8ec3bfccc365
font_01_sfnt_off00010ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC6 10952 bytes
SHA-256: a6db1401df0c545453ddc95b9cca72bfe4425e1c26d205292e9fe43805a58347
font_02_sfnt_off00013457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13457 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf